visual basic barcode printing to the declared type of the array. For example, a byte variable can be placed in an int array. in Java

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An array of objects can hold any object that passes the IS-A (or instanceof)
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test for the declared type of the array. For example, if Horse extends Animal, then a Horse object can go into an Animal array.
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If you assign an array to a previously declared array reference, the array you re
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assigning must be the same dimension as the reference you re assigning it to.
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You can assign an array of one type to a previously declared array reference of
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one of its supertypes. For example, a Honda array can be assigned to an array declared as type Car (assuming Honda extends Car).
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Using a Variable or Array Element That Is Uninitialized and Unassigned When an array of objects is instantiated, objects within the array are not
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instantiated automatically, but all the references get the default value of null.
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When an array of primitives is instantiated, all elements get their default values.
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Two-Minute Drill
Just as with array elements, instance variables are always initialized with
a default value.
Local/automatic/method variables are never given a default value. If you
attempt to use one before initializing it, you ll get a compiler error.
Command-Line Arguments to Main Command-line arguments are passed to the String array parameter in the
main method.
The first command-line argument is the first element in the main String
array parameter.
If no arguments are passed to main, the length of the main String array
parameter will be zero.
1: Language Fundamentals
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all the choices carefully! These questions are very similar to the kinds of questions you ll see on the latest exam. Again, don t worry if you have trouble with them at first; the style of the exam questions can take some getting used to. For example, you might find yourself looking at the answers and wanting to kick yourself for missing little things that you actually knew, but just didn t see in the question. The best advice we have for both the practice questions and the real exam is to always look again. As soon as you get an idea in your head about the answer to a question, imagine someone standing next to you and whispering in your ear, Are you sure Look again. Much of the time, you ll look again and say, I m sure, especially since your first reaction is often the best one to go with. But you ll be surprised by how often that second look brings up something new.
Java Programming Language Keywords (Objective 4.4)
1. Given the following,
1. 2. 3. 4. 5. 6. 7. public class Test { public static void main(String [] args) { signed int x = 10; for (int y=0; y<5; y++, x--) System.out.print(" " + x); } }
what is the result (Choose one.)
A. 10 9 8 7 6 B. 9 8 7 6 5 C. Compilation fails D. An exception is thrown at runtime 2. Which is a reserved word in the Java programming language (Choose one.) A. method B. native C. subclasses D. reference E. array
Self Test
3. Which one of these lists contains only Java programming language keywords (Choose one.) A. class, if, void, long, Int, continue B. goto, instanceof, native, finally, default, throws C. try, virtual, throw, final, volatile, transient D. strictfp, constant, super, implements, do E. byte, break, assert, switch, include 4. Which two are keywords (Choose two.) A. interface B. unsigned C. Float D. this E. string
Literals and Ranges of All Primitive Data Types (Objective 4.6)
5. Which three are valid declarations of a char (Choose three.) A. char c1 = 064770; B. char c2 = face ; C. char c3 = 0xbeef; D. char c4 = \u0022; E. char c5 = \iface ; F.
char c6 = \uface ;
6. Which two are valid declarations of a String (Choose two.) A. String s1 = null; B. String s2 = null ; C. String s3 = (String) abc ; D. String s4 = (String) \ufeed ; E. String s5 = strings rule ;
1: Language Fundamentals
7. Which one is a valid declaration of a boolean (Choose one.) A. boolean b1 = 0; B. boolean b2 = false ; C. boolean b3 = false; D. boolean b4 = Boolean.false(); E. boolean b5 = no; 8. What is the numerical range of a char (Choose one.) A. 128 to 127 B. (2 ^ 15) to (2 ^ 15) - 1 C. 0 to 32767 D. Platform dependent E. 0 to 65535 9. Which three are valid declarations of a float (Choose three.) A. float f1 = -343; B. float f2 = 3.14; C. float f3 = 0x12345; D. float f4 = 42e7; E. float f5 = 2001.0D; F.
float f6 = 2.81F;
Array Declaration, Construction, and Initialization (Objective 1.1)
10. Which three are legal array declarations (Choose three.) A. int [] myScores []; B. char [] myChars; C. int [6] myScores; D. Dog myDogs []; E. Dog myDogs [7]; 11. Given the following,
1. 2. public class Test { public static void main(String [] args) {
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